private void BottomTZNextBtn_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
int newIndex = _selectedIndex < 0 ? (ItemsSources.Count > 0 ? 0 : -1) : (_selectedIndex + 1) % ItemsSources.Count;
if (_selectedTZPicItem != null)
{
_selectedTZPicItem.IsSelected = false;
}
if (newIndex < 0)
{
return;
}
_selectedTZPicItem = ImageListSubCanvas.Children[newIndex] as TZPicItem;
(ImageListSubCanvas.Children[newIndex] as TZPicItem).IsSelected = true;
}
//更新视图
private void UpdateView()
{
if (ItemsSources != null)
{
int length = ItemsSources.Count;
//初始化画布
Canvas.SetTop(ImageListSubCanvas, 0);
ImageListSubCanvas.Children.Clear();
//循环向画布中添加图片
for (int i = 0; i < length; i++)
{
//初始化图片
TZPicItem TZPicItem = new TZPicItem {
Width = 83, Height = 83
};
TZPicItem.PicImage.Source = ItemsSources[i];
TZPicItem.Tag = i;
//设置图片位置
Canvas.SetTop(TZPicItem, i * TZPicItem.Height);
//添加图片SelectionChanged事件
TZPicItem.SelectionChanged += (s, e) =>
{
TZPicItem sender = s as TZPicItem;
if (!sender.IsSelected)
{
return;
}
//更新当前选中图片索引
_selectedIndex = int.Parse(TZPicItem.Tag.ToString());
//让选中的图片移动到中间
// 计算要移动的位移
double offset = (double.Parse(TZPicItem.Tag.ToString()) + 0.5) * TZPicItem.ActualHeight - ImageListCanvas.ActualHeight / 2;
offset = offset > 0 ? offset : 0;
//动画移动
Storyboard moveStory = new Storyboard();
DoubleAnimation animation = new DoubleAnimation();
animation.To = -offset;
animation.Duration = new Duration(new TimeSpan(0, 0, 0, 0, 300));
Storyboard.SetTarget(animation, ImageListSubCanvas);
Storyboard.SetTargetProperty(animation, new PropertyPath("(Canvas.Top)"));
moveStory.Children.Add(animation);
moveStory.Begin();
//初始化变换
CompositeTransform trans = ShowImage.RenderTransform as CompositeTransform;
trans.Rotation = _rotation = 0;
//初始化图片大小
InitShowImageSize();
ShowImage.Source = TZPicItem.PicImage.Source;
showImageStory.Begin();
};
//添加图片MouseLeftButtonUp事件
TZPicItem.MouseLeftButtonUp += (s, e) =>
{
if (_selectedTZPicItem != null)
{
_selectedTZPicItem.IsSelected = false;
}
_selectedTZPicItem = TZPicItem;
TZPicItem.IsSelected = true;
TZPicItem.Cursor = Cursors.Hand;
};
//把图片添加到画布中
ImageListSubCanvas.Children.Add(TZPicItem);
//设置默认选中参数
if (length > 0)
{
_selectedIndex = 0;
_selectedTZPicItem = (ImageListSubCanvas.Children[0] as TZPicItem);
_selectedTZPicItem.IsSelected = true;
}
}
}
}